Improvement in separating stones



D. J. HUNTER. SBPARATING STONES, &0., FROM CLAY, &0.

Patented Sept. 6, '18'70.

following to be 'a full, :clear, and exact illlniicd $121125 fittest (Bflfiirr.

DAVID JAMES HUNTER, OF BOSTON; MASSACHUSETTS.

Letters Patent No. 107,053, dated September 6, 1870.

W IMPROVEMENT m SEPARATING- s'rorms, 8m, PROM CLAY, 8m.

The Schedule referred to in these Letters Patent and making part of the same.

To all to whom these presents shall come:

Be-itknowu that I, DAVID JAMES HUNTER, of Boston, in the couutyof Suffolk and State of Massachusetts, have made certain Improvements in Machines for Separating Hard Substances or Particles from a Mass of Soit'Earthy Matter, as well 'as to divide or granplate the mass; and do hereby declare the description thereof, due reference being had to the accompanying drawing making part of this specification, and in which.

Figure 1 is a perspective view, 'and Figure 2, a vertical and longitudinal section of said invention.

In such drmvi-riga and b represent two drums .or cylinders, mounted upon parallel shafts, -c (I, which revolve in -boxes formed in suitable stndards, ef e f, the disposition of the two cylinders beingsuch that their peripheries revolve in juxtaposition, but in. opposite-directions, such revolutions being effected by a train of gears, g hij, the two former of which are afiigred one'to each drum, but not in contact, while the other two, c'j, mesh into each other and into-said gears g h, the latter-mentioned gears being mounted upon shafts, k' I, supported in suitable bearings, situated below the shafts c d.before mentioned.

The gear 1: is thedriving-gear of the machine.

The standards f f which support the drum b are rocker standards, and make part of arocker frame a, the fulcrum or center of motion of such frame beingthe shaft 1, before mentioned as carrying the gear j hence, any vibration of the drum 11 toward or away from the drum a will not disengage its gear h from the gear j, which meshes into'aud drives it.

' The drum 1) is forced toward or in contact with its fellow drum a by acoiledspring, m, orits equivalent,

placed below the rocker frame a, the power of this spring or agent being of such extent as to, force clay or earth into the interstices o o 0, &c., of the periphcries of the drums, or to crush and force into'the sunc any hard or lumpy particlesof clay which may occur, but which shall yet posses sufficient elasticity to yield before a stone or' other approximatingl y hard or foreign body which the clay may contain. The clay will be forced into the interior of the drums, while the stones, &c., will fall between them to the ground, the result being not only a'perfect separation of the two, but a minute division or granulation. I

p in the drawing denotes ascrapcr, which is suitably disposed within each drum, and in contact or I immediately adjacent to the inner periphery of each,

the effect of such scraper being to scrape or detach from such periphery the mass of clay which oozes through its interstices.

The power end of each scraper p is of such sha'pe and disposition as to conduct the falling clay-from the interior of the drum to any desired locality.

Shorild any undue amount of clay adhere to the outer periphery of the drum, it is to be removed by a scraper properly situated to effect its removal.

A suitable hopper-is to be placed over the point of union of the two drums a and b, to facilitate and guide the introduction of clay or other substance thereto. I i

It is manifest that, instead of mountingthe cylinder b in rocking bearings, the cylinder a may be mounted in such hearings, or, indeed, both cylinders,

if desired, may be'so. mounted.

Having now described my invention,

What Iclaim, andEdesir'e-to secure by Letters Patent, is-

The combination, in a machine such as described, of the two separating-cylinders a and b, when either or both of said cylinders are mounted in rocking bearings, and upheld by' spring pressure, which willen- .able them to separate, so as to allow the passage of stones and like 'rubstanees between them, substantially as shown and set forth, 'DAVID J A MES HUNTER.

Witnesses:

' FRED. Qunrxs,

.EDW. GRIFFITH. 

